Effects of mechanical properties of electric loading system on surplus torque

2016 ◽  
Author(s):  
Han-Xiao Chen ◽  
Dong-Kai Shen ◽  
Xiao Yang
Keyword(s):  
Mechanical Properties ◽  
Electric Loading ◽  
Loading System ◽  
Surplus Torque

scholarly journals Research on design method of double-loop electric servo loading system with high-frequency band based on H∞ control strategy

2020 ◽  
pp. 002029402096213
Author(s):  
Yang Shui ◽  
Jianli Wei ◽  
Jie Yan
Keyword(s):  
Frequency Band ◽  
Loop System ◽  
Aerodynamic Load ◽  
Double Loop ◽  
Hardware In The Loop ◽  
Load Spectrum ◽  
Electric Loading ◽  
Technical Requirements ◽  
Loading System ◽  
High Dynamic

In the hardware-in-the-loop simulation, the goal of electric loading is to realize the accurate tracking of the torque signal and test the performance of the aircraft actuator system. For some high dynamic aircraft, it is necessary to reduce the influence of the surplus torque to increase the system frequency band. This paper introduces a new electric loading system which adopts a double-loop servo motor as the torque loading mechanism. It applies two loops to track the position of the rudder and the aerodynamic load spectrum respectively. For the purpose of reducing the disturbance between two loops of the scheme, a two-DOF H∞ robust controller is designed, which improves the robustness of the system effectively. The simulation results show that the new system increases the upper limit of 25 Hz frequency band of the traditional single-loop system with PID control to the maximum of 40 Hz. The double-loop system thereby meets the technical requirements of the hardware-in-the-loop simulation experiment for high dynamic aircrafts.

Research on Control Algorithm of Electric Loading System

2013 ◽  
Vol 579-580 ◽  
pp. 818-822
Author(s):  
Xiang Zhang ◽  
Guang Lin Wang ◽  
Xu Dong Pan ◽  
Hai Bing Xie
Keyword(s):  
Pid Control ◽  
Control Algorithm ◽  
Simulation Analysis ◽  
Feed Forward ◽  
Complex Control ◽  
Electric Loading ◽  
Loading System ◽  
Disturbance Torque

The disturbance torque which is caused by the interference of the motor position has observably impact on accuracy of the loading system. According to unstable loading channel and disturbance torque, this paper use a complex control algorithm of differential forward PID control and feed-forward compensation. At the end of this paper, the simulation analysis results show that the feed-forward compensation can observably eliminate the influence of the disturbance torque, and improve the accuracy of the loading system.

Electrostatic Spinning Preparation and Mechanical Properties of PLGA Fibers and Fiber Membrane

2013 ◽  
Vol 834-836 ◽  
pp. 847-854
Author(s):  
Le Lun Jiang ◽  
Yong Huang ◽  
Jin Tian Ling ◽  
Zhang Qi Feng ◽  
Xi Feng Qiao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Glycolic Acid ◽  
Tensile Modulus ◽  
Fiber Membrane ◽  
Elongation At Break ◽  
Electrostatic Spinning ◽  
Fiber Membranes ◽  
Loading System ◽  
Main Factor

PLGA (polylactic-co-glycolic acid) is an ideal material for biodegradable medical suture. PLGA fibers and fiber membrane was prepared by using electrostatic spinning, the surface morphology of PLGA fibers and fiber membranes was observed by SEM, and mechanical properties of PLGA fibers and fiber membranes were tested by self-developed micro-force loading system. Experimental results were found that the arrangement of PLGA fibers due to surface tension and friction between fibers was the main factor on mechanical properties of PLGA fibers. The tensile strength of two fibers in winding arrangement was 1.81 times of fibers arranged in parallel at a given number. The tensile strength of three fibers in winding arrangement was 1.25 times of fibers arranged in parallel at a given number. For 80.6 % porosity and 1.028-5.764 mm width PLGA fiber membranes, tensile strength was 1.06-1.47 MPa, tensile modulus was 9.14-13.6 MPa, and elongation at break was 10.8 % to 11.6 %. The tension of fiber membranes increased with its width.

scholarly journals Experimental Study on the Fracturing Behaviors and Mechanical Properties of Cracks under Coupled Hydro-Mechanical Effects in Rock-like Specimens

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1355 ◽  
Author(s):  
Yimeng Zhou ◽  
Cheng Zhao ◽  
Chunfeng Zhao ◽  
Chuangchuang Ma ◽  
Junfei Xie
Keyword(s):  
Mechanical Properties ◽  
Water Pressure ◽  
Triaxial Compression ◽  
Hydraulic Pressure ◽  
External Compression ◽  
Compression Loading ◽  
Mechanical Effects ◽  
Secondary Cracks ◽  
Loading System ◽  
New Type

The artificial fracturing technique under coupled hydro-mechanical effects is widely used in many rock engineering. Therefore, the study on the fracturing behaviors and mechanical properties of hydro-mechanical coupled cracks is very crucial. In this study, a series of fracturing tests were conducted on the cylinder gypsum specimens with single pre-existing cracks using triaxial compression loading system. Water pressure was applied inside the pre-existing cracks and led to the specimen failure with external compression loading. A new type of cracks, namely horizontal coupled cracks (HCC), were found in some specimens. Macroscopic observations reveal that HCC, which were mainly caused by the hydraulic pressure, were different from any tensile wing cracks, shear secondary cracks, or shear anti-wing cracks. Subsequently, a microscopic study was performed using scanning electron microscope (SEM), the outcomes suggest that: (1) Shear fracturing zones (SFZ) and tensile fracturing zones (TFZ) under coupled hydro-mechanical effects displayed distinct characteristics on orientations, length, and independence of gypsum grains; and (2) the HCC were tensile cracks when they just initiated from outer tips of pre-existing cracks. While tensile stress made major contribution to the specimen failure during the whole fracturing processes, the HCC became tensile and shear mixed cracks when the specimen was about to fail.

Development of Orthogonal Electric Steering Loading System

2015 ◽  
Vol 764-765 ◽  
pp. 685-690
Author(s):  
Jie Zhang ◽  
Zu Yao Yu ◽  
Su Hua Lou
Keyword(s):  
Rotation Speed ◽  
Target Motion ◽  
Direct Drive ◽  
Drive Motor ◽  
Loading System ◽  
Surplus Torque

Based on the model of electric direct drive motor, the development of a steering loading system is presented, and the effect of the rotation speed and system rigidity on the surplus torque of a certain steering loading system is analyzed. Compromising system rigidity is needed both to buffer the surplus torque caused by target motion and to maintain system bandwidth and responsibility.

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